Abstract

This work focused on a new application of the shock-and-release technique for equation of state(EOS)measurements. Warm dense matter states at near normal solid density and at temperatures close to 10 eV in diamond and graphite samples were created using a deep release from a laser-driven shock at the OMEGA laser facility. Independent temperature, density, and pressure measurements that do not depend on any theoretical models or simulations were obtained using imaging x-ray Thomson scattering,radiography,velocity interferometry, and streaked optical pyrometry. The experimental results were reproduced by the 2-D FLASH radiation hydrodynamics simulations finding a good agreement. The final EOSmeasurement was then compared with widely used SESAME EOS models as well as quantum molecular dynamics simulation results for carbon, which were very consistent with the experimental data.

The authors would like to acknowledge the hard work of the LANL Target Fabrication Group, P. A. Keiter, and S. R. Klein from U. of Michigan for their work on the IXTS, D. Lamb for help with the FLASH code and OMEGA Experimental Team. This research was supported by the US DOE/NNSA under Contract No. DE-AC52-06NA25396. The software used in this work was developed in part by the DOE NNSA ASC-and DOE Office of Science ASCR-supported Flash Center for Computational Science at the University of Chicago.